Since time began, it seems, people have been putting off they have done today, scolding themselves in the meantime．
A. that, must
B. that, should
C. what, could
D. what, would
网友回答
A. that, must
B. that, should
(答案→)C. what, could
D. what, would
解析：
句意是：自从时间开始，人们一直推迟他们本可以今天做的事，同时又会责备自己。第一空用what引导宾语从句，做do的宾语，第二空填could，表示虚拟语气，could have done是本可以做却没有做。选C。